English
Signet 2850 Conductivity/Resistivity Sensor Electronics (PVDF)
*3-2850.090-1*
3-2850.090-2
Rev. B 01/15
Operating Instructions
3-2850-51, 3-2850-52
with ¾-in. adapter
Description
• Signet 2850 Conductivity/Resistivity Sensor Electronics provides either a two-wire
4 to 20 mA output or Digital (S3L) format.
• The 4 to 20 mA output models provide eight ranges for each electrode cell constant,
plus the ability to invert each range.
• The EasyCal feature allows the devices to automatically recognize standard
conductivity test solution values for simple field calibration.
3-2850-61, 3-2850-62, 3-2850-63
with Universal adapter
• The Conductivity Sensor provided with integral systems will have its custom cell
constant information programmed into the electronics at the factory to provide a
2% sensor accuracy. See page 6 for details.
Table of Contents
3-2850-51-XXV(D), 3-2850-52-XXV(D)
PVDF Integral System
Description ............................................................................................ 1
Dimensions ........................................................................................... 1
Warranty Information ............................................................................ 2
Product Registration ............................................................................. 2
Safety Information................................................................................. 2
Specifications........................................................................................ 2
Conductivity Sensor Dimensions .......................................................... 3
Operating Range Chart......................................................................... 3
In-Line Installation................................................................................. 4
Tank Installation .................................................................................... 4
4 to 20 mA Wiring ................................................................................. 5
Digital (S3L) Wiring................................................................................ 5
Dual Input Wiring (Dual Digital (S3L) Output)........................................ 5
Cell Constant Selection ........................................................................ 6
Range Selection for 4 to 20 mA Output ................................................ 7
Calibration............................................................................................. 8
EasyCal ................................................................................................ 8
Dual Input Calibration ........................................................................... 8
Maintenance ......................................................................................... 9
Troubleshooting .................................................................................... 9
Electronic Certification ........................................................................ 10
Ordering Information ........................................................................... 12
Dimensions
2850-51, -52 Integral mount
•
•
•
•
•
English
Deutsch
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Italiano
95 mm
3.74 in.
2850-61, -62, -63 Universal mount
95 mm
3.74 in.
85 mm
3.34 in.
82 mm
3.24 in.
Warranty Information
Specifications
Refer to your local Georg Fischer Sales office for the most
current warranty statement.
General
Compatible Electrodes ............. Any Signet Conductivity/
Resisitivity electrode
(2818-2823, 2839-2842)
Temperature Compensation ..... PT-1000 RTD (2% per °C)
Pure Water Compensation ....... Auto-switching when using
0.01 cell and raw conductivity
value < 0.5 μS
EasyCal
Automatic recognition of the following conductivity values:
• 146.93 μS, 1408.8 μS, 12856 μS (@ 25 °C)
(Test solutions per ASTM D1125-95)
• 10 μS, 100 μS, 200 μS, 500 μS, 1000 μS, 5000 μS, 10,000 μS,
50,000 μS, 100,000 μS (@ 25 °C)
All warranty and non-warranty repairs being returned must
include a fully completed Service Form and goods must be
returned to your local GF Sales office or distributor.
Product returned without a Service Form may not be
warranty replaced or repaired.
Signet products with limited shelf-life (e.g. pH, ORP, chlorine
electrodes, calibration solutions; e.g. pH buffers, turbidity
standards or other solutions) are warranted out of box but not
warranted against any damage, due to process or application
failures (e.g. high temperature, chemical poisoning, dry-out) or
mishandling (e.g. broken glass, damaged membrane, freezing
and/or extreme temperatures).
Product Registration
Thank you for purchasing the Signet line of Georg Fischer
measurement products.
If you would like to register your product(s), you can now
register online in one of the following ways:
• Visit our website www.gfsignet.com.
Under Service and Support click on
Product Registration Form
• If this is a pdf manual (digital copy), click here
Safety Information
1.
2.
3.
4.
5.
6.
Depressurize and vent system prior to installation or removal.
Confirm chemical compatibility before use.
Do not exceed maximum temperature/pressure specifications.
Wear safety goggles or faceshield during installation/service.
Do not alter product construction.
When using chemicals or solvents, care should be taken
and appropriate eye, face, hand, body, and/or respiratory
protection should be used.
Caution / Warning / Danger
Indicates a potential hazard. Failure to follow all warnings
may lead to equipment damage, injury, or death
Electrostatic Discharge (ESD) / Electrocution Danger
Alerts user to risk of potential damage to product by ESD,
and/or risk of potential of injury or death via electrocution.
Personal Protective Equipment (PPE)
Always utilize the most appropriate PPE during
installation and service of Signet products.
Pressurized System Warning
Sensor may be under pressure, take caution to vent
system prior to installation or removal. Failure to do so
may result in equipment damage and/or serious injury.
Note / Technical Notes
Highlights additional information or detailed procedure.
2
2850 Conductivity/Resistivity Sensor Electronics
Power
• 12 to 24 VDC (4 to 20 mA output)
• 5 VDC ±5% regulated, 3.0 mA max. for Digital (S3L) output
(Reverse polarity and short circuit protected)
Digital (S3L) Output................. Serial ASCII, TTL level 9600 bps
Accuracy
• Conductivity .......................... ±2% of reading
• Temperature .......................... ±0.5 °C
Resolution
• Conductivity .......................... 0.1% of reading
• Temperature .......................... < 0.2 °C
Update Rate
• Single Input models .............. < 600 ms
• Dual Input models ................. < 1.2 s
Current Output
Field-selectable ranges. Factory set span:
• 0.01 cell (2818, 2819, 2839) .. 4 to 20 mA = 0 to 100 μS
• 0.10 cell (2820, 2840) ........... 4 to 20 mA = 0 to 1000 μS
• 1.0 cell (2821, 2841) ............. 4 to 20 mA = 0 to 10,000 μS
• 10.0 cell (2822, 2842) ........... 4 to 20 mA = 0 to 200,000 μS
• 20.0 cell (2823) ..................... 4 to 20 mA = 0 to 400,000 μS
Max. Loop Resistance .............. 50 Ω @ 12 VDC
325 Ω @ 18 VDC
600 Ω @ 24 VDC
Accuracy ................................... ±2% of output span
Resolution................................. 7 μA
Update Rate ............................. <600 ms
Error Indication ......................... 22 mA
Available data via Digital (S3L) Output
• Raw conductivity
• Calibrated conductivity
• Calibrated temperature-compensated conductivity
• Temp. Error Indication ........... Open input and out-of-range
diagnostics for temperature or
internal electronic error.
Environmental
Material ..................................... PBT
Enclosure Rating ...................... NEMA 4X/IP65
Operating Temperature............. -10 to 85 °C (14 to 185 °F)
Storage Temperature ................ -20 to 85 °C (-4 to 185 °F)
Relative Humidity...................... 0 to 95%, non-condensing
Shipping Weight ....................... 0.75 kg (1.75 lb.)
Standards and Approvals
• CE, RoHS Compliant
• Manufactured under ISO 9001 for Quality,
ISO 14001 for Environmental Management and
OHSAS 18001 for Occupational Health and Safety.
China RoHS (Go to www.gfsignet.com for details)
This device complies with Part 15 of the FCC rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) This device must accept any interference received,
including interference that may cause undesired operation.
Conductivity Sensor Dimensions
73.7 mm
2.90 in.
59.3 mm
2.33 in.
35.8 mm
1.41 in.
3-2839
41.9 mm
1.65 in.
21.5 mm
0.85 in.
26.8 mm
1.13 in.
3-2841, 3-2842
3-2840
4.6 m (15 ft)
cable (std)
T1 = 50 mm (2.0 in.)
T2 = 64 mm (2.5 in.)
152 mm
(6 in.)
¾ in. NPT
73.66 mm
(2.9 in.)
107 mm
(4.2 in.)
152 mm
(6.0 in.)
126 mm
(5.0 in.)
2820-x
20.3 mm
(0.8 in.)
49.5 mm
(1.95 in.)
41.91 mm
(1.65 in.)
32.39 mm
(1.28 in.)
2821-x
7.6 mm
(0.3 in.)
12.7 mm
(0.5 in.)
89 mm
3.5 in.
13 mm
(0.5 in.)
12.7 mm
(0.5 in.)
3-2819, 3-2820, 3-2821
Sanitary
3-2819, 3-2820, 3-2821
3-2818
203 mm
8.0 in.
3-2823
Operating Range Chart
Cooling Tower
Waste Waters
Bottled
Water
UPW @ 25°C USP
(20.0 Cell)
(10.0 Cell)
(1.0 Cell)
(0.10 Cell)
Deionization Regen. Chemicals
Alkali Cleaners, Acids/Bases
2823
2822/2842
2821/2841
2820/2840
(0.01 Cell)
2818/2819/2839
0.010 μS 0.055 μS
0Ÿ 0Ÿ
1 μS
0Ÿ
0.5 μS
10 μS 50 μS 100 μS 200 μS 1,000 μS
.Ÿ
.Ÿ
20 μS
10,000 μS
100,000 μS
400,000 μS
50,000 μS 200,000 μS
2850 Conductivity/Resistivity Sensor Electronics
3
In-Line Installation
Tank Installation
While the 2850-5X and 2850-6X electronics cannot be
submerged, either model will accommodate tank installation.
Select any electrode with a 5 m (15 ft) cable. The cable may
be cut to length, but it CANNOT BE EXTENDED.
Most of the Conductivity/Resistivity electrodes
used with the 2850 can be installed into
standard 3/4 in. (NPT or ISO 7-R3/4) fittings.
The 2850-5X models are designed for
integral systems, where the electronics
are attached directly to the sensor.
The preferred installation for in-line applications directs flow
straight into the electrode. This configuration reduces the
probability of entrapped air bubbles, and provides the best
continuous sampling of the fluid content.
If the electrode is mounted vertically in a tee, do not recess
the electrode orifices inside the tee. Mounting upside down
may help prevent air entrapment.
An oversized tee or flow cell may be helpful for inline
installations.
At least 4 threads (ANSI B1.20.1) must be engaged to meet
the pressure rating as published in the specifications.
Use the 2850-6X models for in-line installations where the
electronics must be separated from the electrode.
Conductivity electrodes with sanitary flange fittings must be
installed using this option.
4
2850 Conductivity/Resistivity Sensor Electronics
The universal adapter included with 2850-6X models can
be attached to the top of a tank or mounted to a surface near
the tank.
Adapt the 2850-5X models to tank installations by attaching a
clamp to the conduit.
4 to 20 mA Wiring
4
2
20
3 V2
4-20 mA Loop Output
Sensr Gnd
(SHIELD)
4
1 V+
Temp. IN
(WHITE)
1
ON
2
3
CTS
9 VDC
to
26 VDC
1
ON
4
3
CTS
Maximum length of 4 to 20 mA loop is 300 meters (1000 ft)
Signal RTN
(BLK)
SW1
D3
Signal IN
(RED)
Digital (S3L) Wiring
3-8900.621C
I/O Module 3-8900.401-X
The Digital (S L) output is compatible with the
Signet 8900 Multi-Parameter Controller and
the Signet 9900 Transmitter.
3
Refer to the wiring sections of the 8900 or 9900
manual to determine cable length limitations.
Frequency
Input
1
Frequency
Input 2
OR
S3L
Input
2
S3L
Input
1
1
+5VDC (Black)
Freq. Input (Red)
GND (Shield)
+5VDC (Black)
Freq. Input 2 (Red)
S 3 L (Red)
GND (White/Shield)
+5VDC (Black)
S 3 L (Red)
GND (White/Shield)
2
3
4
5
6
7
3 Gnd
8
9
2 Data
10
1 V+
Sensr Gnd
(SHIELD)
11
IMPORTANT: Provide Earth Ground as
indicated by
symbol.
Temp. IN
(WHITE)
4
CTS
+
-
12
ON
2
(if applicable)
3
Analog Output 1
Analog Output 2
(if applicable)
+
-
1
13
Signal RTN
(BLK)
14
SW1
D3
SHLD
V+
GND
DATA
Note: The 2819-2823 and 2839-2842 sensors can
connect directly to the 9900 via the 9900's
optional Direct Conductivity/Resistivity
Module 3-9900.394 (159 001 699).
Signal IN
(RED)
9900 S3L Input
er
DC Pow
ge
Loop Volta
White
3-9900.395 le
Modu
H COMM
Red
Black
Dual Digital (S3L) Input Wiring
3-8900.621C
3
4
5
6
3
9
+
-
1
12
13
(if applicable)
+
-
4
1 V+
3
(if applicable)
Analog Output 2
Input 2
2
2 Data
10
11
Analog Output 1
CTS
3 Gnd
8
4
7
2
1
2
Input 1
1
If the Dual Input model is used with a single
sensor, connect the sensor to Input 1 and set
all of the Input 2 switches to OFF (OPEN).
S 3L
Input
1
CTS
Sensors may be the same or different cell
constants.
Frequency
Input 2
OR
S3L
Input
2
+5VDC (Black)
Freq. Input (Red)
GND (Shield)
+5VDC (Black)
Freq. Input 2 (Red)
S 3 L (Red)
GND (White/Shield)
+5VDC (Black)
S 3 L (Red)
GND (White/Shield)
ON
Dual Input is available on Digital (S L) output
model 3-2850-63 only, for use with the Signet
8900 Multi-Parameter Controller.
Frequency
Input
1
ON
I/O Module 3-8900.401-X
3
14
SW1
D3
Dual Input applications usually include one sensor with a smaller cell constant and
one sensor with a larger cell constant. Place the larger cell constant on Input 1.
Sensor 2
Sensor 1
This allows periodic recalibration of the larger cell by simply turning Input 2 OFF (OPEN).
IMPORTANT: Provide Earth Ground as indicated by
symbol.
2850 Conductivity/Resistivity Sensor Electronics
5
Cell Constant Selection
Single Input 2850 Electronics
(2850-51, 2850-52, 2850-61, 2850-62)
2
1
CTS
ON
1
2
3
4
SW1
SW3 or SW4
CTS
ON
1
D3
• Single input models use only SW3.
• Use SW3 #1-3 to select the cell constant for the
first sensor.
• Use SW3 #4 to disable the PT1000 Temp
Compensation function in the 2850 (as required for
USP applications).
3
NOTE:
To work correctly with the 9900,
the 2850 must be set for the
custom cell constant or the actual
electrode cell constant and the
9900 set for a 1.0 cell constant.
2
3
Custom Cell Constant
4
SW3
CTS
ON
Closed
Input 1
• Recommended:
Make all switch settings before supplying power.
Switch changes made after supplying power will
take 15 to 20 seconds before becoming effective.
Open
1
2
4
3
0.01/cm-1
Integral 2850 Systems (Single Input)
• The 2850-51-XX and 2850-52-XX are shipped from the factory with the custom cell
constant and temperature offset programmed into the single-input electronics.
• SW3 will be preset to "Custom cell constant".
• No additional modifications are required.
Replacing Integral System Electrode or Electronics
CTS
ON
Closed
Open
1
2
4
3
0.1/cm-1
• When installing a new conductivity electrode or replacing System Electronics, the SW3
switches must be configured to select the appropriate cell constant.
• See Single Input section above.
• Leaving SW3 in the custom cell constant configuration will effect accuracy.
• Use calibration standards to calibrate (see page 8).
CTS
ON
Closed
Open
1
2
4
3
1.0/cm-1
Closed
Open
1
2
1
CTS
ON
1
2
3
10.0/cm-1
4
Closed
CTS
ON
CTS
ON
Open
D3
1
2
3
4
SW3
1
2
3
4
1
SW4
Input 1 Input 2
6
20.0/cm-1
CTS
Open
1
#1
C
C
O
C
O
C
#1
C
C
O
C
O
C
2
#2
C
O
C
C
O
O
#3
C
O
O
O
C
C
#4
O
O
O
O
O
O
Cell Constant
Custom
0.01 cm-1
0.1 cm-1
1.0 cm-1
10.0 cm-1
20.0 cm-1
#4: (O) Open = Input 2 INACTIVE
(C) Closed = Input 2 ACTIVE
4
3
Examples
1.0 cell constant,
temp comp Active
CTS
ON
2850 Conductivity/Resistivity Sensor Electronics
4
3
Closed
SW4 = Cell Constant and Input 2
#4: (O) Open = Temp Comp ACTIVE
(C) Closed = Temp Comp INACTIVE
2
ON
SW3 = Cell Constant and
Temperature Compensation
Cell Constant
Custom
0.01 cm-1
0.1 cm-1
1.0 cm-1
10.0 cm-1
20.0 cm-1
CTS
ON
NOTE: Dual Input applications usually include one sensor with a smaller cell constant and one
sensor with a larger cell constant. Place the larger cell constant on Input 1.
This allows periodic recalibration of the larger cell by simply turning Input 2 OFF (OPEN).
#4
O
O
O
O
O
O
4
3
3
• Recommended:
Make all switch settings before supplying power.
Switch changes made after supplying power will
take 15 to 20 seconds before becoming effective.
#3
C
O
O
O
C
C
2
SW1
• Switch banks SW3 and SW4 are used to select the
cell constant of the electrodes.
• Use SW3 #1-3 to select the cell constant for the
first sensor.
• Use SW3 #4 to disable the PT1000 Temp
Compensation function in the 2850 (as required for
USP applications).
This disables the function for BOTH INPUTS.
• Use SW4 #1-3 to select the cell constant for the
second sensor.
• Set SW4 #4 to OPEN to disable Input 2.
#2
C
O
C
C
O
O
CTS
ON
Dual Input 3-2850-63 Electronics
Closed
1
2
3
4
Open
1.0 cell constant,
temp comp Inactive
CTS
ON
Closed
1
2
3
4
Open
Range Selection for 4 to 20 mA Output
CTS
ON
3
4
3
2
2
1
1
• The Range selection switch bank (SW2) provides eight range
selections for each cell constant.
• Each range can be inverted, making a total of 16 range options.
• Select a range from the table below and set SW2 as indicated.
SW2
D3
10.0 Cell
20.0 Cell
0 to 2 μS
0 to 20 μS
0 to 200 μS
0 to 400 μS
2 to 0 μS
20 to 0 μS
200 to 0 μS
400 to 0 μS
2 to 10 MΩ
0 to 5 μS
0 to 50 μS
0 to 500 μS
0 to 1000 μS
10 to 2 MΩ
5 to 0 μS
50 to 0 μS
500 to 0 μS
1 000 to 0 μS
O
0 to 2 MΩ
0 to 10 μS
0 to 100 μS
0 to 1 000 μS
0 to 2 000 μS
C
2 to 0 MΩ
10 to 0 μS
100 to 0 μS
1 000 to 0 μS
2 000 to 0 μS
O
0 to 1 μS
0 to 50 μS
0 to 5 000 μS
0 to 5 000 μS
0 to 10 000 μS
C
1 to 0 μS
50 to 0 μS
500 to 0 μS
5 000 to 0 μS
10 000 to 0 μS
O
0 to 5 μS
0 to 100 μS
0 to 1 000 μS
0 to 10 000 μS
0 to 20 000 μS
C
5 to 0 μS
100 to 0 μS
1 000 to 0 μS
10 000 to 0 μS
20 000 to 0 μS
O
0 to 10 μS
0 to 200 μS
0 to 2 000 μS
0 to 50 000 μS
0 to 100 000 μS
C
10 to 0 μS
200 to 0 μS
2 000 to 0 μS
50 000 to 0 μS
100 000 to 0 μS
O
0 to 50 μS
0 to 500 μS
0 to 5 000 μS
0 to 100 000 μS
0 to 200 000 μS
C
50 to 0 μS
500 to 0 μS
5 000 to 0 μS
100 000 to 0 μS
200 000 to 0 μS
O
O
0 to 100 μS
0 to 1 000 μS
0 to 10 000 μS
0 to 200 000 μS
0 to 400 000 μS
O
C
100 to 0 μS
1000 to 0 μS
10 000 to 0 μS
200 000 to 0 μS
400 000 to 0 μS
0.01 Cell
#2
#3
#4
C
C
C
O
10 to 20 MΩ
C
C
C
C
20 to 10 MΩ
O
C
C
O
O
C
C
C
C
O
C
C
O
C
O
O
C
O
O
C
C
C
O
C
C
O
O
C
O
O
C
O
C
O
O
C
O
O
O
O
O
O
NOTE:
0.10 Cell
1.0 Cell
SW2 Switch Setting
#1
3
4
1
2
3
4
SW3
CTS
ON
The electrode installed is the 3-2840-1V, with a 0.10 cell constant.
The required output is 4 to 20 mA = 0 to 100 μS.
Set SW2 switch bank to C-C-O-O.
To invert range (4 to 20 mA = 100 to 0 μS), close switch #4.
2
SW2
SW1
Example (refer to shaded selections of chart):
•
•
•
•
CTS
ON
1
Resistivity Ranges in BOLD
Switch #4 inverts the loop output range
(O) Open = 4 to 20 mA
(C) Closed = 20 to 4 mA
2850 Conductivity/Resistivity Sensor Electronics
7
Calibration
• All 2850 Conductivity/Resistivity Sensor Electronics are factory calibrated for maximum out-of-the-box accuracy.
• The EasyCal feature allows calibration to be performed at the sensor.
SW2
SW4
Input 2
ON
2
3
2
4
CTS
b
1
1
2
c
f
4
3
CTS
SW3
Input 1
1
d.
e.
f.
3
ON
c.
SW2: 4 to 20 mA output range selection switch bank
Power and Output terminal block: 4 to 20 mA or
Digital (S3L) Outputs
SW3 and SW4: Electrode Cell Constant selection
switch banks
D3: LED indicator
SW1: EasyCal Push-button
Input 1 & Input 2: Conductivity Electrode connections
1
a.
b.
ON
2
3
CTS
a
4
The 2839-2842 Conductivity sensors come with a certificate
of calibration. This certificate provides information regarding
the actual cell constant and temperature offset as tested and
verified according to NIST standards. This information has
been programmed into the 2850 electronics as its default
factory value. If required, the sensor can be recertified by
contacting the GF Signet repair department.
NOTE:
When the electrode is changed from its original factory
provided electrode or the application requires a cell constant
change, reset SW3 or SW4 switches (see page 6).
Then perform a wet calibration with calibration standards.
e
SW1
d
D3
EasyCal
EasyCal is a single-point calibration system. During this procedure, if the measured value is within ±10% of any of the test
values listed below, the 2850 will automatically recognize the test value and calibrate the output to that value.
NOTE: The first step (Reset) is recommended each time an electrode is replaced, but is NOT necessary upon initial installation or
periodic calibration.
1.
Reset the 2850 Sensor to factory calibration: Set all switches on SW3 (and SW4 for Dual Input) to OPEN. Apply power, wait
at least 3 seconds, then press and hold SW1 until the LED (D3) comes on steady then goes off again (approx. 10 seconds).
When the LED goes off, release SW1; reset is complete. Reset SW3 and SW4 to the proper settings.
2.
Place the electrode/sensor assembly into the conductivity test solution appropriate to your operating range. Shake the
electrode to dislodge any air bubbles visible on the surface of the electrode.
• 146.93 μS, 1408.8 μS, 12856 μS (per ASTM D1125-95)
• 10 μS, 100 μS, 200 μS, 500 μS, 1000 μS, 5000 μS, 10,000 μS, 50,000 μS, 100,000 μS.
Allow at least 2 minutes for the electrode response to stabilize.
3.
Press and hold SW1 for approximately 8 to 10 seconds. During this time, the LED will come on steady then go back off.
(If the LED blinks several times rapidly, the calibration was not successful. See the troubleshooting section).
Calibration is complete. Return the system to service.
Dual Input Calibration
Dual Input 3-2850-63 Electronics
• The 2850-63 can only be calibrated if both inputs are used, or if Input 2 is disabled.
• To disable Input 2: Set SW4, #4 to OPEN.
• Place each sensor into a test solution that represents the operating range of that sensor. When SW1 is pressed, the 2850 will
calibrate both inputs simultaneously.
• Dual Input applications usually include one sensor with a smaller cell constant and one sensor with a larger cell constant.
Place the larger cell constant on Input 1. This allows periodic recalibration of the larger cell by simply turning Input 2 OFF (OPEN).
8
2850 Conductivity/Resistivity Sensor Electronics
Maintenance
The 2850 requires no periodic maintenance.
• Coatings on the electrode may cause slow response or drift.
• Clean metallic surfaces with a mild detergent and a non-abrasive brush or cotton swab.
Troubleshooting
LED and Output Condition
Possible Causes
Suggested Solutions
• SW3 and SW4 set to all OPEN
(factory setting).
• No electrode installed.
• SW3 (and SW4) not set correctly.
• System not ready.
•
•
•
•
During EasyCal, the LED blinks
rapidly for 4 seconds.
• Measured value of the test solution is
outside the ±10% tolerance.
• The electronics or the electrode is
defective.
• Use fresh test solutions and restart
the calibration.
• Replace the electronics or the
electrode.
After completing calibration
procedure, the output values are
inaccurate.
• Insufficient time allowed for electrode
stabilization during calibration procedure.
• Test solutions are contaminated.
• EasyCal performed with temp comp
Inactive, then temp comp Active for
measurement. (or vice versa)
• Recalibrate and wait at least 2
minutes after placing electrode in
solution before pressing SW1.
• Use fresh test solutions and restart
the calibration.
The output of the 2850 indicates a
value that is off by a factor of 10
(e.g. 10x, 100x the correct value)
• The cell constant selection on the
2850 (SW3 or SW4) does not match
the actual input.
• Match the 2850 switch settings to
agree with the sensor being used.
Current Out:
LED off, current output is 22 mA
(S3L) out: "Check Sensor"
Normal for new system.
Install electrode.
Set SW3 and SW4 correctly.
Retry (recycle power).
2850 Conductivity/Resistivity Sensor Electronics
9
Electronic Certification
Signet offers conductivity simulators in five different values. These tools enable the user to validate the performance of the
electronics independently of the electrode. This requirement is defined by ASTM D 1125-95 (Standard Test Methods for Electrical
Conductivity and Resistivity of Water) which is commonly used for USP 24 applications.
Cond. - Resist.
Simulator
@ 25°C
For use with Signet
2850 Conductivity
NIST Traceable
3-2850.101-1
(159 001 392)
1.0 μS ±0.1%
3-2850.101-2
(159 001 393)
2.5 μS ±0.1%
3-2850.101-3
(159 001 394)
10.0 μS ±0.1%
3-2850.101-4
(159 001 395)
18.2 MΩ ±0.1%
3-2850.101-5
(159 001 396)
10.0 MΩ ±0.1%
Before using the Simulator:
Before using the simulators, disconnect all electrodes and reset the 2850 Electronics to factory calibration:
1. Set all switches on SW3 (and SW4 for Dual Input) to OPEN. Turn the power on, wait at least 3 seconds
2. Press and hold SW1 until the LED (D3) comes on steady then goes off again (approx. 10 seconds).
3. When the LED goes off, release SW1. Reset is complete.
To validate Input 1:
1. Turn the power off.
2. Set SW3 to accept a 0.01 cell constant. Leave SW4 in the all-OPEN position.
3. Install the simulator into the 2850 at the Input 1 conductivity electrode terminals.
4. Connect the 2850 output terminals to the appropriate display instrument. Turn the power on.
• The display should indicate a conductivity value within ±2% of the simulator value.
• If the output is x10 or x100 of the correct value, recheck step 2. The 2850 is not set to accept a 0.01 cell constant.
• If the correct value is displayed, the electronics are calibrated to ASTM D 1125 specifications. Remove the simulator and
reset SW3 to the correct cell constant before reinstalling the electrode.
• If the correct value is not displayed, contact the factory.
To validate Input 2:
1. Turn the power off.
2. Set SW4 to accept a 0.01 cell constant.
3. Install the simulator into the 2850 at the Input 2 conductivity electrode terminals.
4. Set SW3 switches to the all-OPEN position.
5. Turn the power on and repeat step 4.
Remember to reset all switches to their correct position before resuming normal operation.
10
2850 Conductivity/Resistivity Sensor Electronics
Notes
2850 Conductivity/Resistivity Sensor Electronics
11
Ordering Information
Signet 2850 Conductivity/Resistivity Sensor Electronics
*All versions include EasyCal
Mfr. Part No.
3-2850-51
Code
159 001 398
Description
2850 Sensor Electronics with Digital (S3L) Output and ¾ inch adapter
3-2850-52
159 001 399
2850 Sensor Electronics with 4 to 20 mA Output and ¾ inch adapter
3-2850-61
159 001 400
2850 Sensor Electronics with Digital (S3L) Output and Universal adapter
3-2850-62
3-2850-63
159 001 401
159 001 402
2850 Sensor Electronics with 4 to 20 mA Output and Universal adapter
2850 Sensor Electronics with Dual Inputs, Dual Digital (S3L) Outputs and Universal adapter
(for use with 8900 only)
3-2850-51-39V
3-2850-51-40V
3-2850-51-41V
3-2850-51-42V
159 001 818
159 001 819
159 001 820
159 001 821
Integral 2850 system, Digital (S3L) output, 0.01 cell, PVDF NPT threads
Integral 2850 system, Digital (S3L) output, 0.1 cell, PVDF NPT threads
Integral 2850 system, Digital (S3L) output, 1.0 cell, PVDF NPT threads
Integral 2850 system, Digital (S3L) output, 10.0 cell, PVDF NPT threads
3-2850-51-39VD
159 001 822
Integral 2850 system, Digital (S3L) output, 0.01 cell, PVDF ISO threads
3-2850-51-40VD
3-2850-51-41VD
3-2850-51-42VD
159 001 823
159 001 824
159 001 825
Integral 2850 system, Digital (S3L) output, 0.1 cell, PVDF ISO threads
Integral 2850 system, Digital (S3L) output, 1.0 cell, PVDF ISO threads
Integral 2850 system, Digital (S3L) output, 10.0 cell, PVDF ISO threads
3-2850-52-39V
3-2850-52-40V
3-2850-52-41V
3-2850-52-42V
159 001 826
159 001 827
159 001 828
159 001 829
Integral 2850 system, 4 to 20 mA output, 0.01 cell, PVDF NPT threads
Integral 2850 system, 4 to 20 mA output, 0.1 cell, PVDF NPT threads
Integral 2850 system, 4 to 20 mA output, 1.0 cell, PVDF NPT threads
Integral 2850 system, 4 to 20 mA output, 10.0 cell, PVDF NPT threads
3-2850-52-39VD
3-2850-52-40VD
3-2850-52-41VD
3-2850-52-42VD
159 001 830
159 001 831
159 001 832
159 001 833
Integral 2850 system, 4 to 20 mA output, 0.01 cell, PVDF ISO threads
Integral 2850 system, 4 to 20 mA output, 0.1 cell, PVDF ISO threads
Integral 2850 system, 4 to 20 mA output, 1.0 cell, PVDF ISO threads
Integral 2850 system, 4 to 20 mA output, 10.0 cell, PVDF ISO threads
Parts and Accessories
3-9000.392-1
159 000 839
Liquid-tight connector kit, 1 set, 1/2 in. NPT
3-9000.392-2
3-2850.101-1
3-2850.101-2
3-2850.101-3
3-2850.101-4
3-2850.101-5
Liquid-tight connector kit, 1 set, PG 13.5
Plug-in NIST-traceable recertification tool, 1.0 μS
Plug-in NIST-traceable recertification tool, 2.5 μS
Plug-in NIST-traceable recertification tool, 10.0 μS
Plug-in NIST-traceable recertification tool, 18.2 MΩ
Plug-in NIST-traceable recertification tool, 10.0 MΩ
159 000 841
159 001 392
159 001 393
159 001 394
159 001 395
159 001 396
Georg Fischer Signet LLC, 3401 Aero Jet Avenue, El Monte, CA 91731-2882 U.S.A. • Tel. (626) 571-2770 • Fax (626) 573-2057
For Worldwide Sales and Service, visit our website: www.gfsignet.com • Or call (in the U.S.): (800) 854-4090
For the most up-to-date information, please refer to our website at www.gfsignet.com
3-2850.090-2 Rev. B 01/15 English
© Georg Fischer Signet LLC 2015